Q.1
Frank-Read source is a mechanism of dislocation multiplication.
  • a) True
  • b) False
Q.2
The stress required to activate the longest Frank-Read source would be _____ and _____ on the crystal structure.
  • a) large, depends
  • b) large, doesn’t depend
  • c) small, depends
  • d) small, doesn’t depend
Q.3
The density of dislocations increases by an order of ____ in magnitude during deformation.
  • a) 2-4
  • b) 6-7
  • c) 8-9
  • d) 12-13
Q.4
What is density of dislocations in annealed crystal?
  • a) 108-1010 m-2
  • b) 1010-1012 m-2
  • c) 1012-1014 m-2
  • d) 1014-1016 m-2
Q.5
What is the density of dislocations in heavily deformed crystal?
  • a) 108-1010 m-2
  • b) 1010-1012 m-2
  • c) 1012-1014 m-2
  • d) 1014-1016 m-2
Q.6
Which metals can be cold worked to the largest extent?
  • a) FCC
  • b) BCC
  • c) HCP
  • d) SC
Q.7
Higher dislocation density ____ yield strength of the metal.
  • a) increases
  • b) decreases
  • c) doesn’t affect
  • d) can increase or decrease
Q.8
Dislocations generate on _____ under applied stress.
  • a) every plane
  • b) slip planes
  • c) planes with Frank-Read source
  • d) {1 1 1} planes
Q.9
The stress required for the generation of dislocation through Frank-Read source is inversely proportional to _____
  • a) shear modulus
  • b) burgers vector
  • c) distance between the pinning sites
  • d) p-n stress
Q.10
Which factor is not a reason of Frank-Read source immobile pinning sites?
  • a) Other solute atoms
  • b) Second phase particles
  • c) Solvent atoms
  • d) Intersection with other dislocations
Q.11
Which of the following term is used to refer to the immobile pinning sites in the Frank-Read source?
  • a) Nodal points
  • b) Pin points
  • c) Frank points
  • d) Shear points
Q.12
The dislocation bowing decreases with increasing applied stress.
  • a) True
  • b) False
0 h : 0 m : 1 s